Checking The Head And Cylinder - APRILIA QUASAR 125 2003 Workshop Manual

ENGINE
QUASAR 125-180

3.2.20 CHECKING THE HEAD AND CYLINDER

Using a rounded soft scraper, remove any carbon deposits from the head.
Take care not to damage the spark plug thread and to avoid aluminium parts.
Remove any deposits from the cylinder head combustion chamber.
Then measure head flatness. If necessary, restore head flatness - 0.05 mm
limit - as follows:
- rest a metal scale on cylinder head and check flatness with a feeler gauge.
If the value is outside the specified limits, restore flatness using 400-600
soaked emery cloth and working following a "8" movement.
Repeat the same check on the cylinder.
Check that cylinder wall is not seized, worn or scored.
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Release 00/2003 - 09